ibcore: Protect against concurrent access to hardware stats.

Currently access to hardware stats buffer isn't protected, this can
result in multiple writes and reads at the same time to the same
memory location. This can lead to providing an incorrect value to
the user. Add a mutex to protect against it.

Linux commit:
e945130b52bea65d15f9bdf54949d4cb7a88db7f

Reviewed by:	kib
Sponsored by:	Mellanox Technologies // NVIDIA Networking

(cherry picked from commit 912e98cedee2590748a9893d3152b11694de3379)

2 files changed, 32 insertions, 6 deletions

diff --git a/sys/ofed/drivers/infiniband/core/ib_sysfs.c b/sys/ofed/drivers/infiniband/core/ib_sysfs.c
index c393bb64a034..806f4aba6c76 100644
--- a/sys/ofed/drivers/infiniband/core/ib_sysfs.c
+++ b/sys/ofed/drivers/infiniband/core/ib_sysfs.c
@@ -827,10 +827,15 @@ static ssize_t show_hw_stats(struct kobject *kobj, struct attribute *attr,
 		dev = port->ibdev;
 		stats = port->hw_stats;
 	}
+	mutex_lock(&stats->lock);
 	ret = update_hw_stats(dev, stats, hsa->port_num, hsa->index);
 	if (ret)
-		return ret;
-	return print_hw_stat(stats, hsa->index, buf);
+		goto unlock;
+	ret = print_hw_stat(stats, hsa->index, buf);
+unlock:
+	mutex_unlock(&stats->lock);
+
+	return ret;
 }
 
 static ssize_t show_stats_lifespan(struct kobject *kobj,
@@ -838,17 +843,25 @@ static ssize_t show_stats_lifespan(struct kobject *kobj,
 				   char *buf)
 {
 	struct hw_stats_attribute *hsa;
+	struct rdma_hw_stats *stats;
 	int msecs;
 
 	hsa = container_of(attr, struct hw_stats_attribute, attr);
 	if (!hsa->port_num) {
 		struct ib_device *dev = container_of((struct device *)kobj,
 						     struct ib_device, dev);
-		msecs = jiffies_to_msecs(dev->hw_stats->lifespan);
+
+		stats = dev->hw_stats;
 	} else {
 		struct ib_port *p = container_of(kobj, struct ib_port, kobj);
-		msecs = jiffies_to_msecs(p->hw_stats->lifespan);
+
+		stats = p->hw_stats;
 	}
+
+	mutex_lock(&stats->lock);
+	msecs = jiffies_to_msecs(stats->lifespan);
+	mutex_unlock(&stats->lock);
+
 	return sprintf(buf, "%d\n", msecs);
 }
 
@@ -857,6 +870,7 @@ static ssize_t set_stats_lifespan(struct kobject *kobj,
 				  const char *buf, size_t count)
 {
 	struct hw_stats_attribute *hsa;
+	struct rdma_hw_stats *stats;
 	int msecs;
 	int jiffies;
 	int ret;
@@ -871,11 +885,18 @@ static ssize_t set_stats_lifespan(struct kobject *kobj,
 	if (!hsa->port_num) {
 		struct ib_device *dev = container_of((struct device *)kobj,
 						     struct ib_device, dev);
-		dev->hw_stats->lifespan = jiffies;
+
+		stats = dev->hw_stats;
 	} else {
 		struct ib_port *p = container_of(kobj, struct ib_port, kobj);
-		p->hw_stats->lifespan = jiffies;
+
+		stats = p->hw_stats;
 	}
+
+	mutex_lock(&stats->lock);
+	stats->lifespan = jiffies;
+	mutex_unlock(&stats->lock);
+
 	return count;
 }
 
@@ -968,6 +989,7 @@ static void setup_hw_stats(struct ib_device *device, struct ib_port *port,
 		sysfs_attr_init(hsag->attrs[i]);
 	}
 
+	mutex_init(&stats->lock);
 	/* treat an error here as non-fatal */
 	hsag->attrs[i] = alloc_hsa_lifespan("lifespan", port_num);
 	if (hsag->attrs[i])
diff --git a/sys/ofed/include/rdma/ib_verbs.h b/sys/ofed/include/rdma/ib_verbs.h
index 2399a3a53120..b18aa2855166 100644
--- a/sys/ofed/include/rdma/ib_verbs.h
+++ b/sys/ofed/include/rdma/ib_verbs.h
@@ -438,6 +438,9 @@ enum ib_port_speed {
 
 /**
  * struct rdma_hw_stats
+ * @lock - Mutex to protect parallel write access to lifespan and values
+ *    of counters, which are 64bits and not guaranteeed to be written
+ *    atomicaly on 32bits systems.
  * @timestamp - Used by the core code to track when the last update was
  * @lifespan - Used by the core code to determine how old the counters
  *   should be before being updated again.  Stored in jiffies, defaults
@@ -453,6 +456,7 @@ enum ib_port_speed {
  *   filled in by the drivers get_stats routine
  */
 struct rdma_hw_stats {
+	struct mutex	lock; /* Protect lifespan and values[] */
 	unsigned long	timestamp;
 	unsigned long	lifespan;
 	const char * const *names;